Key differences, features, and comparative analysis of Region and Main role.
| Region | Main role |
|---|---|
| PCT | Reabsorbs nearly all glucose, amino acids & ~70–80% of ions and water; maintains pH (secretes H⁺, NH₃; absorbs HCO₃⁻) |
| Loop of Henle | Little reabsorption, but maintains the medullary gradient; ascending limb impermeable to water, descending limb permeable |
| DCT | Conditional reabsorption of Na⁺ & water; secretes H⁺, K⁺, NH₃ (pH and Na⁺–K⁺ balance) |
| Collecting duct | Large water reabsorption → concentrated urine; lets urea into the medulla to keep the gradient |
This comparison table is part of the chapter notes for Excretory Products & Their Elimination. Get complete notes, flashcards, active recall sheets, and test prep modes: